There are several bridges like this in Serbia, including one over the Danube just outside Novi Sad, which carries both the main road, and the main railway to Belgrade - both busy. As there is just one (part-time) lane for road traffic (bi-directional, traffic light controlled), it took us over half an hour to get across it in May, with several trains as well as traffic in the other direction before we got our turn.
(There used to be other bridges there, but they haven’t been rebuilt after being bombed in the last war)